STreaming ARchives: stricter, verifiable, deterministic, highly compressible alternatives to CAR files for atproto repositories.
atproto
car
load cars
+208
-20
-9
star-lite/viz/dist/assets/index-DAzQMesO.js
-9
star-lite/viz/dist/assets/index-DAzQMesO.js
···
1
-
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</p>'),ua=Ft('<p class="msg ok svelte-1n46o8q"> </p>'),ca=Ft('<p class="msg muted svelte-1n46o8q">header CID digest: <code class="svelte-1n46o8q"> </code></p>'),da=Ft(`<main><header><h1>STAR-lite verification</h1> <p>step <span class="ev"> </span> · <span class="ev"> </span> </p></header> <div class="dataset-picker svelte-1n46o8q"><!> <span class="spacer svelte-1n46o8q"></span> <label class="file-button svelte-1n46o8q"><input type="file" accept=".star,application/octet-stream" hidden=""/> load .star file…</label></div> <!> <!> <!> <!> <footer class="svelte-1n46o8q"><p class="svelte-1n46o8q">Stream is at the bottom (lex-ordered keys, layer tags below). The cursor sweeps left to
3
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right. Each MST node lives in its layer's row, spanning the keys it covers. Active
4
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(in-stack) nodes glow cyan; frozen nodes fade to gray once their CID has been linked into
5
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a parent. The final root node lights up amber.</p> <p class="svelte-1n46o8q">For loaded .star files, layers come from <code class="svelte-1n46o8q">floor(leading_zero_bits(sha256(key)) / 2)</code> (atproto MST fanout 4).
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Record CIDs and node CIDs in this viz are placeholders — visualizing the structure
7
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doesn't require the actual DAG-CBOR encoding step.</p> <p class="svelte-1n46o8q">Node labels: <code class="svelte-1n46o8q">Ne</code> = N direct entries (key/value pairs at this layer); <code class="svelte-1n46o8q">Ns</code> = N subtree links (left + per-entry right) into lower layers.
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A non-root MST node always has at least 1 entry; subtree count is bounded by <code class="svelte-1n46o8q">entries + 1</code>.</p></footer></main>`);function ha(e,t){jr(t,!0);const r=[];let n=le("small"),i=le(null),s=le(null),l=le(null),o=z(()=>c(n)==="custom"&&c(i)?c(i).dataset:sn[c(n)]),a=z(()=>Dl(c(o))),f=le(0),h=le(!1),p=le(1),_=z(()=>c(a)[Math.min(c(f),c(a).length-1)]);gn(()=>{c(n),N(f,0),N(h,!1)}),gn(()=>{if(!c(h))return;const A=Math.max(60,800/c(p)),O=setInterval(()=>{c(f)<c(a).length-1?N(f,c(f)+1):N(h,!1)},A);return()=>clearInterval(O)});function v(A){N(f,Math.max(0,Math.min(c(a).length-1,c(f)+A)),!0)}function d(){N(f,0),N(h,!1)}async function b(A){const O=A.target.files[0];if(O){N(l,null),N(s,`parsing ${O.name}…`);try{const g=await O.arrayBuffer(),k=$l(g);N(s,`computing layers for ${k.records.length} keys…`);const R=await Vl(k.records.map(F=>F.key)),Y=k.records.map((F,V)=>({key:F.key,layer:R[V]}));N(i,{label:O.name,dataset:Y,headerCidHex:k.headerCidHex},!0),N(n,"custom");const X=R.reduce((F,V)=>(F[V]=(F[V]??0)+1,F),{}),J=Object.keys(X).sort((F,V)=>+F-+V).map(F=>`L${F}:${X[F]}`).join(" ");N(s,`loaded ${O.name} — ${Y.length} keys (${J})`)}catch(g){console.error(g),N(l,`failed to load ${O.name}: ${g.message}`),N(s,null)}finally{A.target.value=""}}}let w=z(()=>[...Object.keys(sn).map(A=>({value:A,label:`${A} (${sn[A].length})`})),...c(i)?[{value:"custom",label:`${c(i).label} (${c(i).dataset.length})`}]:[]]);var y=da(),E=L(y),D=M(L(E),2),Le=M(L(D)),oe=L(Le),Ee=M(Le,2),ie=L(Ee),se=M(Ee),G=M(E,2),$e=L(G);wt($e,17,()=>c(w),$t,(A,O)=>{var g=oa(),k=L(g),R,Y=M(k);ee(()=>{R!==(R=c(O).value)&&(k.value=(k.__value=c(O).value)??""),ce(Y,` ${c(O).label??""}`)}),Tl(r,[],k,()=>(c(O).value,c(n)),X=>N(n,X)),j(A,g)});var He=M($e,4),je=L(He),nr=M(G,2);{var br=A=>{var O=fa(),g=L(O);ee(()=>ce(g,c(l))),j(A,O)},ir=A=>{var O=ua(),g=L(O);ee(()=>ce(g,c(s))),j(A,O)};lt(nr,A=>{c(l)?A(br):c(s)&&A(ir,1)})}var Kt=M(nr,2);{var xr=A=>{var O=ca(),g=M(L(O)),k=L(g);ee(()=>ce(k,c(i).headerCidHex)),j(A,O)};lt(Kt,A=>{c(n)==="custom"&&c(i)&&A(xr)})}var sr=M(Kt,2);sa(sr,{get snapshot(){return c(_)},get dataset(){return c(o)},get cursorIndex(){return c(_).cursor}});var kr=M(sr,2);aa(kr,{get total(){return c(a).length},onStep:v,onReset:d,get i(){return c(f)},set i(A){N(f,A,!0)},get playing(){return c(h)},set playing(A){N(h,A,!0)},get speed(){return c(p)},set speed(A){N(p,A,!0)}}),ee(A=>{ce(oe,`${c(f)+1} / ${c(a).length??""}`),ce(ie,c(_).event.type),ce(se,` ·
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${A??""}`)},[()=>ql(c(_).event)]),ar("change",je,b),j(e,y),Br()}ji(["change"]);vl(ha,{target:document.getElementById("app")});
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star-lite/viz/dist/assets/index-gGLyeoh4.js
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star-lite/viz/dist/assets/index-gGLyeoh4.js
···
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${e.cid}, link into layer ${e.layer+1}`;case"rootCid":return`root CID: ${e.rootCid}`;default:return e.type}}const la=[{key:"aa",layer:0},{key:"ab",layer:0},{key:"ac",layer:0},{key:"ad",layer:1},{key:"ae",layer:0},{key:"af",layer:0},{key:"ag",layer:0},{key:"ah",layer:1},{key:"ai",layer:0},{key:"aj",layer:2},{key:"ak",layer:0},{key:"al",layer:0},{key:"am",layer:1},{key:"an",layer:0},{key:"ao",layer:0},{key:"ap",layer:0}],fa=[{key:"aa",layer:0},{key:"ab",layer:0},{key:"ac",layer:1},{key:"ad",layer:0},{key:"ae",layer:0}],ca=[{key:"aa",layer:1},{key:"ab",layer:1},{key:"ac",layer:2},{key:"ad",layer:0},{key:"ae",layer:0}],cn={small:la,tiny:fa,emptyBottom:ca},ua=[42,108,0],da=[1,113,18,32],un=36,ai=4096,li=830,fi=1024*1024;function dn(e,t){let r=0,n=1,i=t;for(;i<e.length;){const s=e[i++];if(r+=(s&127)*n,(s&128)===0){if(!Number.isSafeInteger(r))throw new Error("varint overflow");return[r,i-t]}if(n*=128,n>2**49)throw new Error("varint too long")}throw new Error("varint truncated at end of buffer")}function hn(e){return Array.from(e,t=>t.toString(16).padStart(2,"0")).join("")}function ha(e){const t=new Uint8Array(e);let r=0;if(t.length<3+un+1)throw new Error("file too short to contain a STAR-lite header");for(let c=0;c<3;c++)if(t[r+c]!==ua[c])throw new Error(`bad magic at offset 0: expected 2a 6c 00, got ${hn(t.slice(0,3))}`);r+=3;const n=t.slice(r,r+un);for(let c=0;c<4;c++)if(n[c]!==da[c])throw new Error(`bad CID prefix: expected 01 71 12 20, got ${hn(n.slice(0,4))}`);const i=n.slice(4);r+=un;const[s,o]=dn(t,r);if(r+=o,s>ai)throw new Error(`partial commit cbor len ${s} exceeds max ${ai}`);if(r+s>t.length)throw new Error("truncated partial commit cbor");const l=s>0?t.slice(r,r+s):null;r+=s;const a=new TextDecoder("utf-8",{fatal:!0}),f=[];for(;r<t.length;){const[c,v]=dn(t,r);if(r+=v,c>li)throw new Error(`record ${f.length}: key len ${c} exceeds max ${li}`);if(r+c>t.length)throw new Error(`record ${f.length}: truncated key`);let p;try{p=a.decode(t.slice(r,r+c))}catch{throw new Error(`record ${f.length}: key is not valid utf-8`)}r+=c;const[_,h]=dn(t,r);if(r+=h,_>fi)throw new Error(`record ${f.length}: record len ${_} exceeds max ${fi}`);if(r+_>t.length)throw new Error(`record ${f.length}: truncated record body`);if(r+=_,f.length>0&&p<=f[f.length-1].key)throw new Error(`record ${f.length}: key "${p}" not in strict lex order after "${f[f.length-1].key}"`);f.push({key:p,recordSize:_})}return{headerCidDigest:i,headerCidHex:hn(i),partialCommit:l,records:f}}new TextEncoder;const ci=new TextDecoder,va=e=>new Uint8Array(e),pa=va,ce=String.fromCharCode,_a=(e,t,r)=>{if(r<4){if(r<2){if(r===0)return"";const X=e[t];return X&128?null:ce(X)}const m=e[t],S=e[t+1];if((m|S)&128)return null;if(r===2)return ce(m,S);const B=e[t+2];return B&128?null:ce(m,S,B)}const n=e[t],i=e[t+1],s=e[t+2],o=e[t+3];if((n|i|s|o)&128)return null;if(r<8){if(r===4)return ce(n,i,s,o);const m=e[t+4];if(m&128)return null;if(r===5)return ce(n,i,s,o,m);const S=e[t+5];if(S&128)return null;if(r===6)return ce(n,i,s,o,m,S);const B=e[t+6];return B&128?null:ce(n,i,s,o,m,S,B)}const l=e[t+4],a=e[t+5],f=e[t+6],c=e[t+7];if((l|a|f|c)&128)return null;if(r<12){if(r===8)return ce(n,i,s,o,l,a,f,c);const m=e[t+8];if(m&128)return null;if(r===9)return ce(n,i,s,o,l,a,f,c,m);const S=e[t+9];if(S&128)return null;if(r===10)return ce(n,i,s,o,l,a,f,c,m,S);const B=e[t+10];return B&128?null:ce(n,i,s,o,l,a,f,c,m,S,B)}const v=e[t+8],p=e[t+9],_=e[t+10],h=e[t+11];if((v|p|_|h)&128)return null;if(r===12)return ce(n,i,s,o,l,a,f,c,v,p,_,h);const y=e[t+12];if(y&128)return null;if(r===13)return ce(n,i,s,o,l,a,f,c,v,p,_,h,y);const b=e[t+13];if(b&128)return null;if(r===14)return ce(n,i,s,o,l,a,f,c,v,p,_,h,y,b);const g=e[t+14];return g&128?null:ce(n,i,s,o,l,a,f,c,v,p,_,h,y,b,g)},ya=(e,t=0,r=e.length)=>{if(r<=15){const n=_a(e,t,r);if(n!==null)return n}return t===0&&r===e.length?ci.decode(e):ci.decode(e.subarray(t,t+r))},ga=(e,t,r)=>n=>{const i=(1<<t)-1;let s="",o=0,l=0;for(let a=0;a<n.length;++a)for(l=l<<8|n[a],o+=8;o>t;)o-=t,s+=e[i&l>>o];if(o!==0&&(s+=e[i&l<<t-o]),r)for(;(s.length*t&7)!==0;)s+="=";return s},wa=(e,t,r)=>{const n={};for(let i=0;i<e.length;++i)n[e[i]]=i;return i=>{let s=i.length;for(;r&&i[s-1]==="=";)--s;const o=pa(s*t/8|0);let l=0,a=0,f=0;for(let c=0;c<s;++c){const v=n[i[c]];if(v===void 0)throw new SyntaxError("invalid base string");a=a<<t|v,l+=t,l>=8&&(l-=8,o[f++]=255&a>>l)}if(l>=t||(255&a<<8-l)!==0)throw new SyntaxError("unexpected end of data");return o}},ma=e=>Uint8Array.fromBase64(e,{alphabet:"base64",lastChunkHandling:"loose"}),ba=e=>e.toBase64({alphabet:"base64",omitPadding:!0}),os="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",xa=wa(os,6,!1),ka=ga(os,6,!1),as="fromBase64"in Uint8Array,Ea=as?ma:xa,Sa=as?ba:ka,Aa="abcdefghijklmnopqrstuvwxyz234567",Ca=(()=>{const e=new Uint8Array(32);for(let t=0;t<32;t++)e[t]=Aa.charCodeAt(t);return e})(),Mr=String.fromCharCode,ls=e=>{const t=e.length,r=t/5|0,n=t-r*5,i=Ca;let s="",o=0;const l=r/2|0;for(let a=0;a<l;a++){const f=e[o],c=e[o+1],v=e[o+2],p=e[o+3],_=e[o+4],h=e[o+5],y=e[o+6],b=e[o+7],g=e[o+8],m=e[o+9];s+=Mr(i[f>>>3],i[(f<<2|c>>>6)&31],i[c>>>1&31],i[(c<<4|v>>>4)&31],i[(v<<1|p>>>7)&31],i[p>>>2&31],i[(p<<3|_>>>5)&31],i[_&31],i[h>>>3],i[(h<<2|y>>>6)&31],i[y>>>1&31],i[(y<<4|b>>>4)&31],i[(b<<1|g>>>7)&31],i[g>>>2&31],i[(g<<3|m>>>5)&31],i[m&31]),o+=10}if(r&1){const a=e[o],f=e[o+1],c=e[o+2],v=e[o+3],p=e[o+4];s+=Mr(i[a>>>3],i[(a<<2|f>>>6)&31],i[f>>>1&31],i[(f<<4|c>>>4)&31],i[(c<<1|v>>>7)&31],i[v>>>2&31],i[(v<<3|p>>>5)&31],i[p&31]),o+=5}if(n>0){let a=0,f=0;for(let c=o;c<t;c++)a=a<<8|e[c],f+=8;for(;f>=5;)f-=5,s+=Mr(i[a>>>f&31]);f>0&&(s+=Mr(i[a<<5-f&31]))}return s},Cn=1,fs=18,cs=85,us=113,Ta=e=>{if(e.length<36)throw new RangeError("cid too short");const t=e[0],r=e[1],n=e[2],i=e[3];if(t!==Cn)throw new RangeError(`incorrect cid version (got v${t})`);if(r!==us&&r!==cs)throw new RangeError(`incorrect cid codec (got 0x${r.toString(16)})`);if(n!==fs)throw new RangeError(`incorrect cid digest codec (got 0x${n.toString(16)})`);if(i!==32)throw new RangeError(`incorrect cid digest size (got ${i})`);return[{version:Cn,codec:r,digest:{codec:n,contents:e.subarray(4,36)},bytes:e.subarray(0,36)},e.subarray(36)]},Ra=e=>{const[t,r]=Ta(e);if(r.length!==0)throw new RangeError("cid bytes includes remainder");return t},ds=e=>`b${ls(e.bytes)}`,Ia=e=>{if(e.length!==37||e[0]!==0)throw new SyntaxError("invalid binary cid");return Ra(e.subarray(1))},Ma=Symbol.for("@atcute/cid-link-wrapper");var pi;pi=Ma;class hs{constructor(t){fe(this,pi,!0);fe(this,"bytes");this.bytes=t}get $link(){const t=`b${ls(this.bytes)}`;return Object.defineProperty(this,"$link",{value:t,enumerable:!0}),t}toJSON(){return{$link:this.$link}}}const $a=Symbol.for("@atcute/bytes-wrapper");var _i;_i=$a;class vs{constructor(t){fe(this,"buf");fe(this,_i,!0);this.buf=t}get $bytes(){return Sa(this.buf)}toJSON(){return{$bytes:this.$bytes}}}const Oa=e=>new vs(e),Na=e=>e instanceof vs?e.buf:Ea(e.$bytes),Tn=(e,t)=>{if(t<24)return t;let r;switch(t){case 24:{if(r=Pr(e),r<24)throw new TypeError("non-canonical argument encoding");break}case 25:{if(r=Da(e),r<256)throw new TypeError("non-canonical argument encoding");break}case 26:{if(r=Rn(e),r<65536)throw new TypeError("non-canonical argument encoding");break}case 27:{if(r=qa(e),r<4294967296)throw new TypeError("non-canonical argument encoding");break}default:throw new Error(`invalid argument encoding; got ${t}`)}return r},La=e=>{const r=(e.v??(e.v=new DataView(e.b.buffer,e.b.byteOffset,e.b.byteLength))).getFloat64(e.p);return e.p+=8,r},Pr=e=>e.b[e.p++],Da=e=>{let t=e.p;const r=e.b,n=r[t++]<<8|r[t++];return e.p=t,n},Rn=e=>{let t=e.p;const r=e.b,n=(r[t++]<<24|r[t++]<<16|r[t++]<<8|r[t++])>>>0;return e.p=t,n},qa=e=>{const t=Rn(e),r=Rn(e);if(t>2097151)throw new RangeError("can't decode integers beyond safe integer range");return t*2**32+r},ps=(e,t)=>{const r=ya(e.b,e.p,t);return e.p+=t,r},za=(e,t)=>{const r=e.b.subarray(e.p,e.p+=t);return Oa(r)},Fa=(e,t)=>{const r=Ia(e.b.subarray(e.p,e.p+=t));return new hs(r.bytes)},ui=e=>{const t=Pr(e),r=t>>5;if(r!==3)throw new TypeError(`expected map to only have string keys; got type ${r}`);const n=t&31,i=n<24?n:Tn(e,n);return ps(e,i)},Ka=e=>{const t=e.length,r={b:e,v:null,p:0};let n=null,i;e:for(;r.p<t;){const s=Pr(r),o=s>>5,l=s&31,a=o===7?0:l<24?l:Tn(r,l);switch(o){case 0:{i=a;break}case 1:{i=-1-a;break}case 2:{i=za(r,a);break}case 3:{i=ps(r,a);break}case 4:{if(a>0){n={t:1,c:i=new Array(a),k:null,r:a,n};continue e}i=[];break}case 5:{if(i={},a>0){const f=ui(r);n={t:0,c:i,k:f,r:a,n};continue e}break}case 6:{switch(a){case 42:{const f=Pr(r),c=f>>5,v=f&31;if(c!==2)throw new TypeError(`expected cid-link to be type 2 (bytes); got type ${c}`);const p=Tn(r,v);i=Fa(r,p);break}default:throw new TypeError(`unsupported tag; got ${a}`)}break}case 7:{switch(l){case 20:case 21:{i=l===21;break}case 22:{i=null;break}case 27:{i=La(r);break}default:throw new Error(`invalid simple value; got ${l}`)}break}default:throw new TypeError(`invalid type; got ${o}`)}for(;n!==null;){switch(n.t){case 0:{const f=n.c,c=n.k;c==="__proto__"&&Object.defineProperty(f,c,{enumerable:!0,configurable:!0,writable:!0}),f[c]=i;break}case 1:{const f=n.c,c=f.length-n.r;f[c]=i;break}}if(--n.r){if(!n.t){const f=n.k,c=ui(r);if(n.k=c,(c.length-f.length||(c>f?1:c<f?-1:0))<=0)throw new TypeError("map keys are not in canonical order or contain duplicates")}continue e}i=n.c,n=n.n}break}return[i,e.subarray(r.p)]},In=e=>{const[t,r]=Ka(e);if(r.length!==0)throw new Error("decoded value contains remainder");return t},Bt=128,Pt=127,Ba=2**28,Pa=Math.min,_s=(e,t=0,r=e.length)=>{const n=Pa(t+r,e.length);let i=t;if(i>=n)throw new RangeError("could not decode varint");let s=e[i++],o=s&Pt;if(s<Bt)return{value:o,nextOffset:i};if(i>=n)throw new RangeError("could not decode varint");if(s=e[i++],o|=(s&Pt)<<7,s<Bt)return{value:o,nextOffset:i};if(i>=n)throw new RangeError("could not decode varint");if(s=e[i++],o|=(s&Pt)<<14,s<Bt)return{value:o,nextOffset:i};if(i>=n)throw new RangeError("could not decode varint");if(s=e[i++],o|=(s&Pt)<<21,s<Bt)return{value:o,nextOffset:i};if(i>=n)throw new RangeError("could not decode varint");if(s=e[i++],o+=(s&Pt)*Ba,s<Bt)return{value:o,nextOffset:i};let l=35;do{if(i>=n)throw new RangeError("could not decode varint");s=e[i++],o+=(s&Pt)*2**l,l+=7}while(s>=Bt);return{value:o,nextOffset:i}},Ha=e=>{if(e===null||typeof e!="object")return!1;const{version:t,roots:r}=e;return t===1&&Array.isArray(r)&&r.every(n=>n instanceof hs)},Ua=e=>{const{header:t,nextOffset:r}=ja(e,0);let n=r;return{header:t,roots:t.data.roots,iterate(){return{next(){if(n>=e.length)return{done:!0,value:void 0};const i=n,{value:s,nextOffset:o}=_s(e,n,8);n=o;const l=n,{cid:a,nextOffset:f}=Ya(e,n);n=f;const c=n,v=s-(c-l);if(v<0||c+v>e.length)throw new RangeError("unexpected end of data");const p=c+v,_=e.subarray(c,p);return n=p,{done:!1,value:{cid:a,bytes:_,entryStart:i,entryEnd:p,cidStart:l,cidEnd:c,bytesStart:c,bytesEnd:p}}},[Symbol.iterator](){return this}}},[Symbol.iterator](){return this.iterate()}}},ja=(e,t)=>{const r=t,{value:n,nextOffset:i}=_s(e,t,8);if(n===0)throw new RangeError("invalid car header; length=0");const s=i,o=s+n;if(o>e.length)throw new RangeError("unexpected end of data");const l=In(e.subarray(s,o));if(!Ha(l))throw new TypeError("expected a car v1 archive");return{header:{data:l,headerStart:r,headerEnd:o,dataStart:s,dataEnd:o},nextOffset:o}},Ya=(e,t)=>{const r=t+36;if(r>e.length)throw new RangeError("unexpected end of data");const n=e.subarray(t,r),i=n[0],s=n[1],o=n[2],l=n[3];if(i!==Cn)throw new RangeError(`incorrect cid version (got v${i})`);if(s!==us&&s!==cs)throw new RangeError(`incorrect cid codec (got 0x${s.toString(16)})`);if(o!==fs)throw new RangeError(`incorrect cid digest type (got 0x${o.toString(16)})`);if(l!==32)throw new RangeError(`incorrect cid digest size (got ${l})`);return{cid:{version:i,codec:s,digest:{codec:o,contents:n.subarray(4,36)},bytes:n},nextOffset:r}},Va=new TextDecoder("utf-8",{fatal:!0});new TextEncoder;function di(e){if(e&&typeof e.$link=="string")return e.$link;if(e&&e.bytes)return ds(e);throw new Error("expected CidLink or Cid")}function Wa(e){return e&&e.buf instanceof Uint8Array?e.buf:Na(e)}function Ga(e){const t=new Uint8Array(e),r=Ua(t),n=new Map;for(const v of r)n.set(ds(v.cid),v.bytes);if(!r.roots.length)throw new Error("CAR has no root CIDs");const i=di(r.roots[0]),s=n.get(i);if(!s)throw new Error(`commit block not in CAR: ${i}`);let o;try{o=In(s)}catch(v){throw new Error(`commit block is not valid DAG-CBOR: ${v.message}`)}if(!o.data||typeof o.data.$link!="string")throw new Error("commit has no `data` CidLink to MST root");const l=o.data.$link,a=[];let f=new Uint8Array(0);function c(v){const p=di(v),_=n.get(p);if(!_)throw new Error(`MST block not in CAR: ${p}`);let h;try{h=In(_)}catch(y){throw new Error(`MST node ${p} 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The cursor sweeps left to
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right. Each MST node lives in its layer's row, spanning the keys it covers. Active
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(in-stack) nodes glow cyan; frozen nodes fade to gray once their CID has been linked into
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a parent. The final root node lights up amber.</p> <p class="svelte-1n46o8q">For loaded .star files, layers come from <code class="svelte-1n46o8q">floor(leading_zero_bits(sha256(key)) / 2)</code> (atproto MST fanout 4).
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Record CIDs and node CIDs in this viz are placeholders — visualizing the structure
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doesn't require the actual DAG-CBOR encoding step.</p> <p class="svelte-1n46o8q">Node labels: <code class="svelte-1n46o8q">Ne</code> = N direct entries (key/value pairs at this layer); <code class="svelte-1n46o8q">Ns</code> = N subtree links (left + per-entry right) into lower layers.
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A non-root MST node always has at least 1 entry; subtree count is bounded by <code class="svelte-1n46o8q">entries + 1</code>.</p></footer></main>`);function bl(e,t){Wr(t,!0);const r=[];let n=oe("small"),i=oe(null),s=oe(null),o=oe(null);function l(T){return T.length>=3&&T[0]===42&&T[1]===108&&T[2]===0?"star":"car"}let a=K(()=>d(n)==="custom"&&d(i)?d(i).dataset:cn[d(n)]),f=K(()=>oa(d(a))),c=oe(0),v=oe(!1),p=oe(1),_=K(()=>d(f)[Math.min(d(c),d(f).length-1)]);kn(()=>{d(n),N(c,0),N(v,!1)}),kn(()=>{if(!d(v))return;const T=Math.max(60,800/d(p)),w=setInterval(()=>{d(c)<d(f).length-1?N(c,d(c)+1):N(v,!1)},T);return()=>clearInterval(w)});function h(T){N(c,Math.max(0,Math.min(d(f).length-1,d(c)+T)),!0)}function y(){N(c,0),N(v,!1)}async function b(T){const w=T.target.files[0];if(w){N(o,null),N(s,`parsing ${w.name}…`);try{const k=await w.arrayBuffer(),R=new Uint8Array(k),F=l(R);let P,H;if(F==="star"){const A=ha(k);P=A.records,H=`STAR header CID digest: ${A.headerCidHex}`}else{const A=Ga(k);P=A.records,H=`CAR commit CID: ${A.commitCidString} · MST root: ${A.dataCidString} · ${A.blockCount} blocks`}N(s,`${F.toUpperCase()}: computing layers for ${P.length} keys…`);const Se=await el(P.map(A=>A.key)),se=P.map((A,z)=>({key:A.key,layer:Se[z]}));N(i,{label:w.name,dataset:se,headerLabel:H,sourceFormat:F},!0),N(n,"custom");const q=Se.reduce((A,z)=>(A[z]=(A[z]??0)+1,A),{}),U=Object.keys(q).sort((A,z)=>+A-+z).map(A=>`L${A}:${q[A]}`).join(" ");N(s,`loaded ${w.name} (${F.toUpperCase()}) — ${se.length} keys (${U})`)}catch(k){console.error(k),N(o,`failed to load ${w.name}: ${k.message}`),N(s,null)}finally{T.target.value=""}}}let g=K(()=>[...Object.keys(cn).map(T=>({value:T,label:`${T} (${cn[T].length})`})),...d(i)?[{value:"custom",label:`${d(i).label} (${d(i).dataset.length})`}]:[]]);var m=ml(),S=L(m),B=O(L(S),2),X=O(L(B)),Ne=L(X),te=O(X,2),ie=L(te),Z=O(te),Pe=O(S,2),Le=L(Pe);bt(Le,17,()=>d(g),Ht,(T,w)=>{var k=_l(),R=L(k),F,P=O(R);ee(()=>{F!==(F=d(w).value)&&(R.value=(R.__value=d(w).value)??""),de(P,` ${d(w).label??""}`)}),ea(r,[],R,()=>(d(w).value,d(n)),H=>N(n,H)),V(T,k)});var He=O(Le,4),Sr=L(He),sr=O(Pe,2);{var or=T=>{var w=yl(),k=L(w);ee(()=>de(k,d(o))),V(T,w)},ar=T=>{var w=gl(),k=L(w);ee(()=>de(k,d(s))),V(T,w)};ot(sr,T=>{d(o)?T(or):d(s)&&T(ar,1)})}var lr=O(sr,2);{var Ar=T=>{var w=wl(),k=L(w),R=L(k);ee(()=>de(R,d(i).headerLabel)),V(T,w)};ot(lr,T=>{d(n)==="custom"&&d(i)&&T(Ar)})}var fr=O(lr,2);hl(fr,{get snapshot(){return d(_)},get dataset(){return d(a)},get cursorIndex(){return d(_).cursor}});var pt=O(fr,2);pl(pt,{get total(){return d(f).length},onStep:h,onReset:y,get i(){return d(c)},set i(T){N(c,T,!0)},get playing(){return d(v)},set playing(T){N(v,T,!0)},get speed(){return d(p)},set speed(T){N(p,T,!0)}}),ee(T=>{de(Ne,`${d(c)+1} / ${d(f).length??""}`),de(ie,d(_).event.type),de(Z,` ·
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${T??""}`)},[()=>aa(d(_).event)]),ur("change",Sr,b),V(e,m),Gr()}ns(["change"]);Ko(bl,{target:document.getElementById("app")});
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star-lite/viz/dist/index.html
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star-lite/viz/dist/index.html
···
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>STAR-lite verification viz</title>
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<script type="module" crossorigin src="/assets/index-DAzQMesO.js"></script>
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<script type="module" crossorigin src="/assets/index-gGLyeoh4.js"></script>
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<link rel="stylesheet" crossorigin href="/assets/index-B_cDv0fH.css">
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</head>
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<body>
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star-lite/viz/package-lock.json
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star-lite/viz/package-lock.json
···
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"": {
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"name": "star-lite-viz",
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"version": "0.0.0",
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"license": "0BSD",
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"dependencies": {
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"license": "0BSD",
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65
+
"integrity": "sha512-3LsC8XB8TKe9q/5hOA5sFuzGaIFdJZJNewC5OKa3o/eU6+K7JR6see9Zy2JbQERNVnRl11EzbNov1efgLMAs4g==",
66
+
"license": "0BSD"
67
+
},
68
+
"node_modules/@atcute/varint": {
69
+
"version": "2.0.0",
70
+
"resolved": "https://registry.npmjs.org/@atcute/varint/-/varint-2.0.0.tgz",
71
+
"integrity": "sha512-CEY/oVK/nVpL4e5y3sdenLETDL6/Xu5xsE/0TupK+f0Yv8jcD60t2gD8SHROWSvUwYLdkjczLCSA7YrtnjCzWw==",
72
+
"license": "0BSD"
15
73
},
16
74
"node_modules/@esbuild/aix-ppc64": {
17
75
"version": "0.25.12",
+4
star-lite/viz/package.json
+4
star-lite/viz/package.json
+31
-10
star-lite/viz/src/App.svelte
+31
-10
star-lite/viz/src/App.svelte
···
2
2
import { computeSnapshots, describeEvent } from './lib/algorithm.js';
3
3
import { demos } from './lib/dataset.js';
4
4
import { parseStarLite } from './lib/star.js';
5
+
import { parseCar } from './lib/car.js';
5
6
import { computeMstLayers } from './lib/mst.js';
6
7
import Viz from './components/Viz.svelte';
7
8
import Controls from './components/Controls.svelte';
8
9
9
10
let datasetName = $state('small');
10
-
let customDataset = $state(null); // { label, dataset, headerCidHex } | null
11
+
let customDataset = $state(null); // { label, dataset, headerLabel, sourceFormat } | null
11
12
let loadingMessage = $state(null);
12
13
let loadingError = $state(null);
14
+
15
+
function detectFormat(bytes) {
16
+
if (bytes.length >= 3 && bytes[0] === 0x2a && bytes[1] === 0x6c && bytes[2] === 0x00) {
17
+
return 'star';
18
+
}
19
+
return 'car';
20
+
}
13
21
14
22
let dataset = $derived(
15
23
datasetName === 'custom' && customDataset ? customDataset.dataset : demos[datasetName],
···
58
66
loadingMessage = `parsing ${file.name}…`;
59
67
try {
60
68
const buf = await file.arrayBuffer();
61
-
const parsed = parseStarLite(buf);
62
-
loadingMessage = `computing layers for ${parsed.records.length} keys…`;
63
-
const layers = await computeMstLayers(parsed.records.map((r) => r.key));
64
-
const dataset = parsed.records.map((r, idx) => ({ key: r.key, layer: layers[idx] }));
69
+
const bytes = new Uint8Array(buf);
70
+
const format = detectFormat(bytes);
71
+
let records;
72
+
let headerLabel;
73
+
if (format === 'star') {
74
+
const parsed = parseStarLite(buf);
75
+
records = parsed.records;
76
+
headerLabel = `STAR header CID digest: ${parsed.headerCidHex}`;
77
+
} else {
78
+
const parsed = parseCar(buf);
79
+
records = parsed.records;
80
+
headerLabel = `CAR commit CID: ${parsed.commitCidString} · MST root: ${parsed.dataCidString} · ${parsed.blockCount} blocks`;
81
+
}
82
+
loadingMessage = `${format.toUpperCase()}: computing layers for ${records.length} keys…`;
83
+
const layers = await computeMstLayers(records.map((r) => r.key));
84
+
const dataset = records.map((r, idx) => ({ key: r.key, layer: layers[idx] }));
65
85
customDataset = {
66
86
label: file.name,
67
87
dataset,
68
-
headerCidHex: parsed.headerCidHex,
88
+
headerLabel,
89
+
sourceFormat: format,
69
90
};
70
91
datasetName = 'custom';
71
92
const layerHisto = layers.reduce((m, L) => ((m[L] = (m[L] ?? 0) + 1), m), {});
···
73
94
.sort((a, b) => +a - +b)
74
95
.map((L) => `L${L}:${layerHisto[L]}`)
75
96
.join(' ');
76
-
loadingMessage = `loaded ${file.name} — ${dataset.length} keys (${histoStr})`;
97
+
loadingMessage = `loaded ${file.name} (${format.toUpperCase()}) — ${dataset.length} keys (${histoStr})`;
77
98
} catch (err) {
78
99
console.error(err);
79
100
loadingError = `failed to load ${file.name}: ${err.message}`;
···
113
134
{/each}
114
135
<span class="spacer"></span>
115
136
<label class="file-button">
116
-
<input type="file" accept=".star,application/octet-stream" onchange={onFileSelected} hidden />
117
-
load .star file…
137
+
<input type="file" accept=".star,.car,application/octet-stream" onchange={onFileSelected} hidden />
138
+
load .star or .car file…
118
139
</label>
119
140
</div>
120
141
···
125
146
{/if}
126
147
127
148
{#if datasetName === 'custom' && customDataset}
128
-
<p class="msg muted">header CID digest: <code>{customDataset.headerCidHex}</code></p>
149
+
<p class="msg muted"><code>{customDataset.headerLabel}</code></p>
129
150
{/if}
130
151
131
152
<Viz snapshot={snap} {dataset} cursorIndex={snap.cursor} />
+105
star-lite/viz/src/lib/car.js
+105
star-lite/viz/src/lib/car.js
···
1
+
// CAR file parser for atproto repos. Walks the MST starting from the commit's
2
+
// `data` link, yielding (key, recordSize) pairs in lex-key order (= depth-first
3
+
// preorder MST walk). We don't verify CIDs or signatures — the user has opted
4
+
// out of real CID computation, and this is just to feed the viz.
5
+
6
+
import { fromUint8Array as carFromUint8Array } from '@atcute/car';
7
+
import { decode as decodeCbor, fromBytes } from '@atcute/cbor';
8
+
import { toString as cidToString } from '@atcute/cid';
9
+
10
+
const utf8 = new TextDecoder('utf-8', { fatal: true });
11
+
const enc = new TextEncoder();
12
+
13
+
function cidStr(linkOrCid) {
14
+
if (linkOrCid && typeof linkOrCid.$link === 'string') return linkOrCid.$link;
15
+
if (linkOrCid && linkOrCid.bytes) return cidToString(linkOrCid);
16
+
throw new Error('expected CidLink or Cid');
17
+
}
18
+
19
+
function bytesOf(wrapper) {
20
+
if (wrapper && wrapper.buf instanceof Uint8Array) return wrapper.buf;
21
+
return fromBytes(wrapper);
22
+
}
23
+
24
+
export function parseCar(buffer) {
25
+
const bytes = new Uint8Array(buffer);
26
+
const reader = carFromUint8Array(bytes);
27
+
28
+
const blocks = new Map(); // base32 CID string → block bytes
29
+
for (const entry of reader) {
30
+
blocks.set(cidToString(entry.cid), entry.bytes);
31
+
}
32
+
33
+
if (!reader.roots.length) throw new Error('CAR has no root CIDs');
34
+
const commitCidStr = cidStr(reader.roots[0]);
35
+
const commitBytes = blocks.get(commitCidStr);
36
+
if (!commitBytes) throw new Error(`commit block not in CAR: ${commitCidStr}`);
37
+
38
+
let commit;
39
+
try {
40
+
commit = decodeCbor(commitBytes);
41
+
} catch (e) {
42
+
throw new Error(`commit block is not valid DAG-CBOR: ${e.message}`);
43
+
}
44
+
if (!commit.data || typeof commit.data.$link !== 'string') {
45
+
throw new Error('commit has no `data` CidLink to MST root');
46
+
}
47
+
const dataCidStr = commit.data.$link;
48
+
49
+
const records = [];
50
+
let prevKey = '';
51
+
let prevKeyBytes = new Uint8Array(0);
52
+
53
+
function walk(linkCid) {
54
+
const cidString = cidStr(linkCid);
55
+
const block = blocks.get(cidString);
56
+
if (!block) throw new Error(`MST block not in CAR: ${cidString}`);
57
+
let node;
58
+
try {
59
+
node = decodeCbor(block);
60
+
} catch (e) {
61
+
throw new Error(`MST node ${cidString} is not valid DAG-CBOR: ${e.message}`);
62
+
}
63
+
if (!Array.isArray(node.e)) {
64
+
throw new Error(`MST node ${cidString} has no entries array`);
65
+
}
66
+
if (node.l) walk(node.l);
67
+
for (const entry of node.e) {
68
+
if (typeof entry.p !== 'number') throw new Error('MST entry missing prefix length');
69
+
const suffix = bytesOf(entry.k);
70
+
const fullBytes = new Uint8Array(entry.p + suffix.length);
71
+
fullBytes.set(prevKeyBytes.slice(0, entry.p), 0);
72
+
fullBytes.set(suffix, entry.p);
73
+
const key = utf8.decode(fullBytes);
74
+
75
+
let recordSize = 0;
76
+
if (entry.v && entry.v.$link) {
77
+
const valueBytes = blocks.get(entry.v.$link);
78
+
if (valueBytes) recordSize = valueBytes.length;
79
+
}
80
+
records.push({ key, recordSize });
81
+
82
+
prevKey = key;
83
+
prevKeyBytes = fullBytes;
84
+
if (entry.t) walk(entry.t);
85
+
}
86
+
}
87
+
88
+
walk(commit.data);
89
+
90
+
// sanity: keys must come out in strict lex order if the MST is well-formed
91
+
for (let i = 1; i < records.length; i++) {
92
+
if (records[i].key <= records[i - 1].key) {
93
+
throw new Error(
94
+
`CAR walk produced out-of-order keys at ${i}: "${records[i - 1].key}" then "${records[i].key}" — likely malformed MST`,
95
+
);
96
+
}
97
+
}
98
+
99
+
return {
100
+
records,
101
+
commitCidString: commitCidStr,
102
+
dataCidString: dataCidStr,
103
+
blockCount: blocks.size,
104
+
};
105
+
}